nutsinee.kijbunchoo@LIGO.ORG - posted 14:01, Wednesday 16 January 2019 - last comment - 14:08, Wednesday 16 January 2019(46474)
OPO green mode match worsen (again...)
After we closed out HAM6 we took a scan to ensure our alignment were good (alog45372). Our 00 mode was 88.2% then. Today I took another scan and turns out our 00 mode is now down to 78%. That's 10.2% drop.
I put 20dB attenuator on the 80MHz LO during this measurement so I can compare directly to a scan from out close out log. The attenuator has been taken out.
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Also remember when the last fiber started to degrade right before the vent there was some strange mode degradation 44663